Non-invasive cable monitoring device, assembly method, monitoring system and monitoring method

Abstract

The application provides a non-invasive cable monitoring device, an assembling method, a monitoring system and a monitoring method, wherein a measuring port a is formed on the bottom end face of a shielding shell, the protection measuring port comprises an opening area a, an opening area b and an opening area c, the opening area b corresponds to the measuring port a, a first cable groove and a second cable groove are formed on the side wall face of a moving space, an insulation cable shielding member comprises a first part and a second part corresponding to the opening area a and the opening area b respectively on the first side and the second side of the measuring port a, and a third part fixed on the bottom plate; when the moving plate is in the clamping position, the third part is deformed to wrap the bottom of the cable, cover the protection measuring port, the first part and the second part cover the top of the cable, and form the shielding structure of the cable. The application can play a shielding effect, and avoid the instantaneous incremental electric signal generated when the non-invasive cable monitoring device and the metal terminal in the hard pressing plate are in contact.

Description

Technical Field

[0001] This application relates to the technical field of power grid hard plate condition detection, and in particular to a non-invasive cable monitoring device, assembly method, monitoring system and monitoring method. Background Technology

[0002] With the development of smart grids, the automation level of substations has greatly improved the efficiency and safety of power grid operation. As a secondary equipment operating mechanism, the hard switchboard is the hub connecting distribution network protection and automation devices to the outside world. Therefore, the enabled / disabled state of the hard switchboard is an artificially created break point in the protection tripping circuit. This break point directly affects whether the protection function and action output can function normally, providing assurance for maintenance and power safety. The hard switchboard is used to enable or disable corresponding protection functions, and the management of the hard switchboard of relay protection devices requires designated personnel. In the operation of smart grids, when the state of the hard switchboard changes, causing relay protection devices to fail to operate or malfunction, it will seriously affect the safe and reliable operation of power equipment.

[0003] According to the requirements of substation operation regulations, before the hardened voltage plate is put into operation, the voltage between the two ends of the hardened voltage plate and ground needs to be measured to prevent the relay protection device from failing to operate or malfunctioning. Currently, traditional voltage measurement is done manually, usually using a multimeter. This is prone to errors in multimeter range setting, which can lead to the control circuit being open and causing a tripping accident.

[0004] like Figure 1 As shown, the invention patent with publication number CN118884019A discloses a hard plate voltage monitoring device and a hard plate voltage monitoring system, which can convert the sensed electric field strength of the cable into a voltage signal, and realize non-invasive monitoring of the DC voltage of the cable at a fixed distance. It includes an insulating protective shell (i.e., a protective cover and a protective housing), a shielding shell (i.e., a shielding cover and a shielding body), a moving plate and a measuring component 12. The measuring component 12 and the shielding shell are placed inside the protective shell in sequence. The protective shell includes a protective measuring port opened on its bottom end face, and a cable shielding component fixed on the protective measuring port and connected to the shielding body. A moving plate shielding component 14 is installed on the moving plate. When the moving plate moves to a position below the protective measuring port, the cable shielding component and the moving plate shielding component 14 contact to form a shielding cavity. However, since both the cable shield 13 and the movable plate shield 14 are made of metal, if the position of the hard plate voltage monitoring device moves, causing the cable shield 13 or the movable plate shield 14 to come into contact with the metal terminals in the hard plate, an instantaneous incremental electrical signal will be generated, causing the hard plate cabinet to make incorrect operations based on the incremental electrical signal, affecting the normal power supply of the power system.

[0005] Therefore, how to prevent the generation of instantaneous incremental electrical signals after the voltage monitoring device of the hard plate comes into contact with the metal terminals in the hard plate is an urgent problem to be solved. Summary of the Invention

[0006] To address the shortcomings mentioned above, this invention provides a non-invasive cable monitoring device, assembly method, monitoring system, and monitoring method that not only provides shielding but also prevents the generation of instantaneous incremental electrical signals when the non-invasive cable monitoring device comes into contact with the metal terminals in the hard pressure plate.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a non-invasive cable monitoring device, comprising a protective housing, a movable plate, a shielding housing, an insulated cable shield, and a measuring component. The measuring component and the shielding housing are sequentially placed inside the protective housing. A measuring port a is provided on the bottom end face of the shielding housing. The bottom end face of the protective housing is recessed to the top end face to form a base plate and a moving space for the movable plate to move horizontally. A protective measuring port is formed on the base plate. The protective measuring port includes an opening area a, an opening area b, and an opening area c that are sequentially connected. The opening area b corresponds to the measuring port a. A first cable groove and a second cable groove, which correspond to each other and are respectively connected to the protective measuring port, are formed on the side wall of the moving space. The insulated cable shield includes a first part and a second part located on the first and second sides of the measuring port a, respectively corresponding to the opening area a and the opening area b, and a third part with one end fixed to the bottom end face of the base plate.

[0008] When the movable plate is in the engaged position, the third part deforms and wraps around the bottom end face of the cable, covering the protective measuring port. The first part and the second part respectively cover a portion of the top end face of the cable. The first part, the second part and the third part cooperate to form the cable's shielding structure.

[0009] In one embodiment, the first part is fixed to the bottom end face of the shielding housing and is located to the left of the measuring port a;

[0010] The second part is fixed to the bottom end face of the shielding housing and is located to the right of the measuring port a;

[0011] When the shielding housing is placed inside the protective housing, the first part and the second part are sandwiched between the shielding housing and the protective housing, and respectively cover the top end faces of the opening area a and the opening area c.

[0012] In one embodiment, the first part is fixed to the inner side of the bottom end face of the base plate, located to the left of the opening area b, and covering the top end face of the opening area a;

[0013] The second part is fixed to the inner side of the bottom end face of the base plate, located on the right side of the opening area b, and covering the top end face of the opening area c.

[0014] In one embodiment, a downward-facing slot is formed in the base plate near the protective measuring port, and the top end of the third part is fixed in the slot.

[0015] In one embodiment, the base plate further includes a first protrusion and a second protrusion located sequentially on the rear side of the slot, the slot, the first protrusion and the second protrusion being on the same axis.

[0016] In one embodiment, the movable plate includes at least a first step portion, a second step portion, and a third step portion arranged in a stepped manner from bottom to top. A first position groove and a second position groove are formed on the third step portion to mate with the first protrusion, wherein:

[0017] When the first protrusion engages with the first position slot, the movable plate is in the first engaged position, the second stepped portion faces the protective measuring port, and the front end face of the first stepped portion is on the same plane as the front end plate of the protective housing;

[0018] When the first protrusion engages with the second position slot, the movable plate is in the second engaged position, at least a portion of the third step faces the protective measuring port, and the front end face of the first step protrudes from the front end plate of the protective housing.

[0019] In one embodiment, a first mating structure and a second mating structure that cooperate with the second protrusion are also formed on the top surface of the third step portion. The first mating structure is located in front of the first position slot, and the second mating structure is located behind the second position slot. When the second protrusion contacts the second mating structure, it restricts the position of the movable plate. The first mating structure, the first position slot, the second position slot, and the second mating structure are on the same axis.

[0020] Secondly, the present invention also provides an assembly method for assembling the above-mentioned non-invasive cable monitoring device, comprising the following steps:

[0021] Secure the top of the third part into the slot located on the bottom end face of the base plate;

[0022] The shielded housing containing the measurement components is placed in the protective housing, so that the measurement port a corresponds to the opening area b. The first part is located on the left side of the measurement port a and covers the top end face of the opening area a, and the second part is located on the right side of the measurement port a and covers the top end face of the opening area c.

[0023] The protective cover is fastened to the top end face of the protective housing, and the movable plate is set in the movable space inside the protective housing.

[0024] Thirdly, the present invention also provides a monitoring system, including the above-mentioned non-invasive cable monitoring device and a data collector, wherein the data collector is connected to the non-invasive cable monitoring device via a shielded cable;

[0025] The non-invasive cable monitoring device is used to output analog voltage signals for cables;

[0026] The data acquisition device is used to obtain the engagement / disengagement status of the hard plate based on the voltage analog signal.

[0027] Fourthly, the present invention also provides a monitoring method for implementing the above-described monitoring system, comprising the following steps:

[0028] The cable is placed in the first cable groove and the second cable groove. The moving plate moves to the required engagement position, so that the third part of the insulated cable shield is located between the moving plate and the base plate, wrapping a part of the cable and covering the protective measuring port.

[0029] Obtain the voltage dataset of the hard platen within a preset time period;

[0030] Calculate the difference between the maximum and minimum values ​​in the voltage dataset;

[0031] The engagement / disengagement status of the hard pressure plate is determined based on the difference.

[0032] Compared with the prior art, the present invention has one of the following advantages:

[0033] By replacing the existing metal shield with an insulated cable shield, not only can the shielding effect be achieved, but the instantaneous incremental electrical signal generated when the non-intrusive monitoring device of the cable comes into contact with the metal terminal in the hard pressure plate can also be avoided, thus eliminating safety hazards.

[0034] The third part of the insulated cable shield is deformed and wraps around a portion of the cable, covering the measuring port, and together with the first and second parts, forms a shielding structure. When the measuring end of the cable is placed inside the non-intrusive monitoring device of the cable, it can cover the top and bottom end faces of the measuring end of the cable, which can enhance the shielding performance against interference signals in the external environment, improve the accuracy of voltage measurement, and thus obtain the on / off state of the hard pressure plate. Attached Figure Description

[0035] Figure 1 An exploded view of an existing voltage monitoring device;

[0036] Figure 2 This is an exploded view of the non-invasive cable monitoring device in this embodiment;

[0037] Figure 3 This is a structural diagram of the non-invasive cable monitoring device after removing the moving board in this embodiment;

[0038] Figure 4 This is a structural diagram of the movable plate in this embodiment;

[0039] Figure 5 This is a perspective view of the non-invasive cable monitoring device in the first engaged state in this embodiment;

[0040] Figure 6 for Figure 5 A sectional view;

[0041] Figure 7 for Figure 6 Enlarged view of section A;

[0042] Figure 8 for Figure 5 A diagram showing the connection between the non-invasive cable monitoring device and the cable when the device is in the first engaged state.

[0043] Figure 9 for Figure 8 A sectional view;

[0044] Figure 10 for Figure 9 Enlarged view of section B;

[0045] Figure 11 A perspective view of the non-invasive cable monitoring device in the second engaged state in this embodiment;

[0046] Figure 12 for Figure 11 A sectional view;

[0047] Figure 13 for Figure 12 Enlarged view of section C;

[0048] Figure 14 for Figure 11 A diagram showing the connection between the non-invasive cable monitoring device and the cable when the device is in the second engaged state.

[0049] Figure 15 This is a cross-sectional view of the non-intrusive cable monitoring device in an unengaged state.

[0050] Figure 16 for Figure 15Enlarged view of section D;

[0051] Figure 17 This is a structural diagram of the monitoring system in this embodiment;

[0052] Figure 18 This is a flowchart of the monitoring method in this embodiment;

[0053] Figure 19 for Figure 18 Voltage waveform diagram in the monitoring method.

[0054] The main reference numerals are as follows:

[0055] 1-Protective top cover; 101-Snap-on protrusion; 2-Protective housing; 21-Protective measuring port; 211-Opening area a; 212-Opening area b; 213-Opening area c; 22-Side plate; 221-Snap-on fixing port; 222-First slide rail; 223-Second slide rail; 224-First cable channel; 225-Second cable channel; 23-Front end plate; 24-Rear end plate; 25-Bottom plate; 251-First protrusion; 252-Second protrusion; 253-Slot; 254-First hollow area; 255-Second hollow area; 256-Third hollow area; 3-Moving plate; 31-First slide groove; 32 - Second slide groove; 33- First step; 34- Second step; 35- Third step; 36- First position slot; 37- Second position slot; 38- First groove; 39- Second groove; 310- First baffle; 311- Second baffle; 4- Shielding housing; 41- Measurement port a; 5- Insulated cable shield; 51- First part; 52- Second part; 53- Third part; 6- Cable; 7- Non-invasive cable monitoring device; 8- Shielded wire; 9- Data collector; 10- Communication connector; 11- Probe connection connector; 12- Measurement component; 13- Cable shield; 14- Moving plate shield. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0057] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," and "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0058] like Figures 2 to 10 As shown, this embodiment provides a non-invasive cable monitoring device, including a protective cover 1, a protective housing 2, a movable plate 3, a shielding housing 4, an insulated cable shielding component 5, and a measuring component 12. The protective cover 1 and the protective housing 2 cooperate to form an insulated protective housing. The measuring component 12 is placed inside the shielding housing 4 and is grounded to the shielding housing 4. The insulated protective housing is sleeved on the outside of the shielding housing 4 to protect the shielding housing 4. Corresponding cable measuring holes (i.e., corresponding protective measuring ports 21 and measuring ports a41) are formed on the protective housing 2, the insulated cable shielding component 5, and the shielding housing 4. When a cable 6 with a hard plate outlet is provided in the cable measuring hole, the voltage of the hard plate can be obtained by the measuring component 12 according to the electric field generated by the cable 6.

[0059] The protective cover 1, protective housing 2, and movable plate 3 can be made of nylon, ABS plastic, ASA plastic, or other insulating materials to protect the shield housing 4 and also prevent accidental contact with electricity when using the cable 6 at the hard pressure plate outlet for voltage measurement, thus ensuring the safe use of the non-invasive cable monitoring device.

[0060] The shielding housing 4 can be made of metal. When the shielding housing 4 is grounded and connected to the measuring component 12, the shielding housing 4 can shield the interference signals of the external environment, making the measuring component 12 more accurate in measuring the cable 6.

[0061] The measuring component 12 can employ a vibration capacitive electric field sensor, a rotating blade electric field sensor, a piezoelectric thin film electric field sensor, a micro-electro-mechanical system (MEMS) electric field sensor, or a direct induction electric field sensor, etc., capable of measuring the voltage through the electric field of the cable 6. The sensing end of the measuring component 12 corresponds to the measuring hole in the cable.

[0062] The insulated cable shield 5 is made of FPC material with a certain degree of elasticity, or other elastic insulating shielding materials. A shielding film is wrapped around the outside of the FPC material, giving it shielding and insulating properties. When the insulated cable shield 5 wraps around the cable 6, it provides shielding. Furthermore, when the insulated cable shield 5 comes into contact with the metal terminals in the rigid pressure plate, it does not generate instantaneous incremental electrical signals, thus eliminating safety hazards.

[0063] In this embodiment, specifically, the protective housing 2 is a rectangular housing with an open top. A protective measuring port 21 is provided on the bottom end face of the protective housing 2, and the protective cover 1 covers the top opening of the protective housing 2. The movable plate 3 is located on the bottom end face of the protective housing 2 and can be positioned on the bottom end face of the protective housing 2. When the movable plate 3 moves to the engaging position (i.e., the first engaging position or the second engaging position), it is located at the lower end of the protective measuring port 21, so that a part of the insulated cable shield 5 blocks the protective measuring port 21 and a part of the cable 6.

[0064] Furthermore, a buckle protrusion 101 is provided on the protective cover 1, and buckle fixing holes 221 are provided on the side plates 22 of the protective housing 2, which are in the same position as the buckle protrusion 101 and cooperate with it. A shielding wire through hole is also provided on the rear plate 24 of the protective housing 2.

[0065] Furthermore, the protective housing 2 includes a front end plate 23, a side plate 22, a rear end plate 24, and a bottom plate 25. The bottom end of the protective housing 2 is recessed from the top end to form the bottom plate 25 and a moving space for the movable plate 3 to move horizontally. The bottom plate 25 has, from front to back, a protective measuring port 21, a slot 253, a first protrusion 251, and a second protrusion 252. The center points of the protective measuring port 21, the slot 253, the first protrusion 251, and the second protrusion 252 are all on the same axis.

[0066] Since the location of slot 253 is close to the location of protective measuring port 21, it is convenient for part of the insulated cable shield 5 to cover the protective measuring port 21.

[0067] Furthermore, the protective measuring port 21 includes an opening region a211, an opening region b212, and an opening region c213 connected in sequence.

[0068] Furthermore, a first hollow area 254 and a second hollow area 255 are formed on the left and right sides of the first protrusion 251, respectively, and a third hollow area 256 is formed around a portion of the second protrusion 252. The first hollow area 254 and the second hollow area 255 allow the first protrusion 251 to move in the opposite direction to the compressive force when compressed, and the third hollow area 256 allows the second protrusion 252 to move in the opposite direction to the compressive force when compressed.

[0069] Preferably, the first protrusion 251 is an outwardly convex arc-shaped protrusion, and the second protrusion 252 is an inverted protrusion, wherein the bottom end of the first protrusion 251 is lower than the bottom end of the second protrusion 252.

[0070] Furthermore, the two side plates 22 are recessed upwards from local areas of their bottom end faces to form a first cable groove 224 and a second cable groove 225. The tops of the first cable groove 224 and the second cable groove 225 are respectively located above the base plate 25, such that opening area a211 communicates with the first cable groove 224, and opening area b212 communicates with the second cable groove 225. When the cable 6 is placed inside the first cable groove 224 and the second cable groove 225, it is also simultaneously placed in the protective measuring port 21, facilitating measurement of the cable 6 by the measuring component 12.

[0071] Furthermore, on the bottom end face of one of the side plates 22, a first slide rail 222 is formed on the end face other than the first cable groove 224, and on the bottom end face of the other side plate 22, a second slide rail 223 is formed on the end face other than the second cable groove 225. The first slide rail 222 and the second slide rail 223 are on the same plane, so that the movable plate 3 can move horizontally in the moving space.

[0072] Furthermore, the insulated cable shield 5 includes a first part 51, a second part 52, and a third part 53. The first part 51 is fixed to the bottom end face of the shield housing with adhesive and is located to the left of the measuring port a. The second part 52 is fixed to the bottom end face of the shield housing with adhesive and is located to the right of the measuring port a. The top end of the third part 53 is fixed in the slot 253 with adhesive, and the bottom end of the third part 53 is fixed in the slot 253 with adhesive and extends towards the area below the base plate. When the shield housing is placed inside the protective housing, the first part and the second part are sandwiched between the shield housing and the protective housing, and respectively cover the top end faces of the opening area a and the opening area c.

[0073] The third part is a free end. When the movable plate 3 is in the non-engaged position, a portion of the third part 53 can be located outside the moving space. When the movable plate 3 moves to the engaged position, the third part 53 is located between the movable plate 3 and the base plate 25, wrapping the bottom end face of the cable 6 and covering and protecting the measuring port 21.

[0074] In addition, since the first part 51 covers the top end face of the opening area a and the second part 52 covers the top end face of the opening area c, when the moving plate 3 moves to the engaging position, the third part 53 wraps around the bottom end face of the cable 6 and covers and protects the measuring port 21. A part of the cable 6 is placed in the first cable groove 224, and its top end face is covered by the first part 51. The other part of the cable 6 is placed in the second cable groove 225, and its top end face is covered by the second part 52, thereby forming a shielding structure for the cable 6.

[0075] In this embodiment, a first groove 31 that mates with the first slide rail 222 and a second groove 32 that mates with the second slide rail 223 are formed on the side wall of the movable plate 3. The top end face of the movable plate 3 includes a first step portion 33, a second step portion 34 and a third step portion 35 arranged from bottom to top, wherein the first step portion 33, the second step portion 34 and the third step portion 35 are arranged in a stepped structure, and the first groove 31 and the second groove 32 are located between the second step portion 34 and the first step portion 33.

[0076] Furthermore, a first position groove 36 is formed on the top end face of the third step portion 35 to mate with the first protrusion 251. When the first protrusion 251 is placed inside the first position groove 36, the moving plate 3 is in a first engaged position, and the front end face of the moving plate 3 is on the same plane as the front end plate 23 of the protective housing 2. At this time, the second step portion 34 faces the protective measuring port 21, and the fourth part 55 is positioned above the second step portion 34 and the first step portion 33.

[0077] Furthermore, the top end face of the third step portion 35 also includes a first groove 38 and a first baffle 310 located in front of the first position slot 36, and a second baffle 311 and a second groove 39 located behind the first position slot 36. The second protrusion 252 and the second baffle 311 cooperate to form a limiting structure for the movable plate 3. The first groove 38, the first baffle 310, the first position slot 36, the second baffle 311 and the second groove 39 are on the same axis.

[0078] Preferably, the positions of the first groove 38, the first baffle 310, the second baffle 311, and the second groove 39 correspond to the positions of the second protrusion 252.

[0079] Since the top surface of the first baffle 310 is inclined, the second protrusion 252 can pass through the top surface of the third step 35, allowing the movable plate 3 to move forward and be placed in the moving space. Since the top surface of the second baffle 311 is parallel, when the movable plate 3 moves backward, the second protrusion 252 abuts against the second baffle 311, limiting the position of the movable plate 3 and preventing the movable plate 3 from detaching from the moving space during movement. Example 2

[0080] This embodiment provides a non-invasive cable monitoring device. The difference between this embodiment and Embodiment 1 is that:

[0081] The first part is fixed to the inner side of the bottom end face of the base plate with adhesive, located on the left side of opening area b, and covering the top end face of opening area a. The second part is fixed to the inner side of the bottom end face of the base plate with adhesive, located on the right side of opening area b, and covering the top end face of opening area c. When the shielding shell is placed inside the protective shell, both the first and second parts are sandwiched between the shielding shell and the protective shell. Example 3

[0082] like Figures 11 to 14 As shown, this embodiment provides a non-invasive cable monitoring device. The difference between this embodiment and Embodiment 1 or Embodiment 2 is that:

[0083] A first position groove 36 and a second position groove 37 are formed on the top end face of the third step portion 35 to cooperate with the first protrusion 251, wherein the second position groove 37 is located behind the first position groove 36. When the first protrusion 251 is placed in the second position groove 37, the moving plate 3 is in the second engaging position, and the front end face of the moving plate 3 and a part of the first step portion 33 are both located on the front side of the front end plate 23 of the protective housing 2. The front end face of the second step portion 34 is adjacent to the inner wall surface of the moving space, or the front end face of the second step portion 34 abuts against the inner wall surface of the moving space. At this time, at least a part of the third step portion 35 faces the protective measuring port 21.

[0084] Furthermore, the second baffle 311 and the second groove 39 are located behind the first position slot 36 in sequence, and the second protrusion 252 cooperates with the second baffle 311 to form a limiting structure for the movable plate 3. The first groove 38, the first baffle 310, the first position slot 36, the second position slot 37, the second baffle 311 and the second groove 39 are on the same axis.

[0085] Compared to Embodiment 1 and Embodiment 2, since the position of the second step 34 is lower than the position of the third step 35, under the same wire diameter, after the cable 6 is placed in the first cable groove 224 and the second cable groove 225, the distance between the cable 6 and the measuring component 12 is closer in Embodiment 2, and the accuracy of the obtained electrical signal is higher. Example 4

[0086] This embodiment provides an assembly method for assembling the non-invasive cable monitoring device described in Embodiment 1, Embodiment 2, or Embodiment 3, comprising the following steps:

[0087] S1. Fix the top part of the third part into the slot located on the bottom end face of the base plate;

[0088] S2. Place the shielded housing containing the measurement components into the protective housing, so that the measurement port a corresponds to the opening area b. The first part is located on the left side of the measurement port a and covers the top end face of the opening area a, and the second part is located on the right side of the measurement port a and covers the top end face of the opening area c.

[0089] S3. Attach the protective cover to the top end face of the protective housing, and place the movable plate in the movable space within the protective housing.

[0090] For example, in one embodiment, in step S2, the first part is fixed to the bottom end face of the shielding housing by adhesive and is located to the left of the measuring port a; the second part is fixed to the bottom end face of the shielding housing by adhesive and is located to the right of the measuring port a; the top end of the third part is fixed to the slot by adhesive; the bottom end of the third part is fixed to the slot by adhesive and extends to the area below the base plate.

[0091] In another embodiment, for example, in step S2, the first portion is fixed to the inner side of the bottom end face of the base plate, located to the left of the opening region b, and covering the top end face of the opening region a, by adhesive. The second portion is fixed to the inner side of the bottom end face of the base plate, located to the right of the opening region b, and covering the top end face of the opening region c, by adhesive. The top end of the third portion is fixed in a slot by adhesive, and the bottom end of the third portion is fixed in a slot by adhesive, extending towards the lower region of the base plate. Example 5

[0092] like Figure 17As shown, this embodiment provides a hard platen voltage monitoring system, including a data acquisition unit 9 and multiple non-invasive cable monitoring devices 7 as described in Embodiment 1, Embodiment 2, or Embodiment 3. The data acquisition unit 9 includes at least one communication connector 10 and at least one probe connection connector 11. The probe connection connector 11 and the non-invasive cable monitoring devices 7 of the data acquisition unit 9 are connected via shielded cables 8. The non-invasive cable monitoring devices 7 are used to detect the voltage of the cable exiting the hard platen and output an analog voltage signal of the cable 6 at the hard platen exit; the data acquisition unit 9 is used to determine the hard platen's on / off status based on the analog voltage signal. The data acquisition unit 9 includes a microcontroller module and a probe interface module. The microcontroller module is electrically connected to the probe interface module, and the probe interface module is connected to the shielded cables 8. The probe interface module is used to amplify the analog voltage signal; the microcontroller module is used to convert the received analog voltage signal into a data signal (voltage data) based on the analog voltage signal sent by the probe interface module, and to determine the hard platen's on / off status based on the voltage data.

[0093] To ensure safe power supply, the data acquisition unit 9 also includes a power supply module and a power protection module. The power protection module is electrically connected to the power supply module, and the power supply module is electrically connected to the microcontroller module. The power protection module protects the microcontroller module and has functions such as isolation, short circuit protection, overvoltage protection, undervoltage protection, overcurrent protection, voltage regulation, and noise reduction. The power supply module provides power to the microcontroller module.

[0094] To ensure that connected devices do not affect the microcontroller module, the data acquisition unit also includes a serial communication module and a serial port protection module. The serial port protection module is electrically connected to the serial communication module, and the serial communication module is electrically connected to the microcontroller module. The serial port protection module protects the serial communication module from damage caused by voltage surges to both the serial communication module and the microcontroller module. The serial communication module is used to establish communication with other devices and can send the on / off status of the hard switchboard. Example 6

[0095] like Figure 18 As shown, this embodiment provides an operating method for operating the non-invasive cable monitoring device in Embodiment 1, Embodiment 2, or Embodiment 3, including the following steps:

[0096] S101. The cable is placed in the first cable groove and the second cable groove. The moving plate moves to the required engagement position, so that the first part of the insulated cable shield is located between the moving plate and the base plate, wrapping a part of the cable and covering the protective measuring port.

[0097] Specifically, the cable is placed in the first cable groove and the second cable groove. The moving plate is pushed, and through the cooperating first protrusion and the first position slot, or the first protrusion and the second position slot, the moving plate is placed in the first engagement position or the second engagement position. The insulated cable shield can wrap around a part of the cable and cover and protect the measurement port.

[0098] S102. Obtain the voltage dataset of the hard plate within a preset time period.

[0099] Specifically, a non-invasive cable monitoring device can detect the voltage of the cable at the outlet of the hard pressure plate. The data measured by the non-invasive cable monitoring device is then sent to a data acquisition unit, which receives the voltage data measured by the non-invasive cable monitoring device. Voltage data over a recent period are collected to form a voltage dataset. For example, if the preset time period is ten minutes, the voltage data from the current moment and the previous ten minutes are collected to form the voltage dataset.

[0100] The preset time period is determined in the following way:

[0101] The decay waveforms of the monitoring voltage of the hard pressure plate are obtained under different environments. These waveforms represent the voltage changes of the hard pressure plate. In one specific implementation, the horizontal axis of the decay waveform represents time, and the vertical axis represents the voltage of the hard pressure plate. It is important to understand that the voltage changes of the hard pressure plate differ under different environments. Different environments indicate that at least one factor, such as humidity or air pressure, is different. Furthermore, the voltage changes also differ depending on the material of the hard pressure plate's conductors. In one specific implementation, two decay waveforms are obtained, each from an environment with different humidity levels. These two waveforms are designated as the first waveform and the second waveform, respectively. Based on the decay waveforms, the decay time under different environments is calculated. The decay time refers to the time it takes for the voltage to drop to a specified value when the hard pressure plate switches from an active state to an active state. This specified value is set by the operator based on actual conditions. The maximum decay time under different environments is used as the preset time period.

[0102] S103. Calculate the difference between the maximum and minimum values ​​in the voltage dataset.

[0103] S104. Determine the engagement / disengagement status of the hard plate based on the difference.

[0104] When the difference exceeds a preset value, the hard pressure plate's engagement / disengagement state is switched. For example, if the hard pressure plate is currently in the engaged state, and the difference exceeds the preset value, the hard pressure plate's state changes from engaged to disengaged. Similarly, if the hard pressure plate is currently in the disengaged state, and the difference exceeds the preset value, the hard pressure plate's state changes from disengaged to engaged.

[0105] In one specific implementation, taking a DC voltage of 110V when the hard pressure plate is in the engaged state as an example, refer to... Figure 19 The voltage waveform includes the following parameters: S0 (hard plate out of service), where the voltage remains 0V; S1 (hard plate in service), where the voltage output Uo from the hard plate voltage monitoring device rises and stabilizes at 110V within a short time; and S2 (hard plate out of service) when the hard plate is disconnected due to unreliable connection, where the voltage waveform changes as a slow decaying discharge process of the suspended metal body. The decay change value Δy is set to the difference between the stable voltage 110V and 10% of the stable voltage 110V, i.e., Δy = 110V - 110V × 10%. Under two different humidity conditions, the decay time Δt for the difference between Uo and the measured DC voltage 110V to be greater than Δy is recorded as Δt1 and Δt2, respectively.

[0106] The decay time Δt can vary significantly depending on environmental changes. (Refer to...) Figure 19 A time threshold ΔT, i.e., a preset time period, is set with a relatively large decay time Δt. If the output voltage Uo of the monitoring device remains stable at around 110V, the hard platen is considered to be in operation. However, due to changes in the external environment, Uo may jump within ΔT. Within ΔT, if the maximum change in Uo is less than Δy, the state of the hard platen is considered unchanged; if the maximum change in Uo is not less than Δy, the state of the hard platen is considered to have changed. Δy is the preset difference value.

[0107] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A non-invasive cable monitoring device, comprising a protective housing, a moving plate, a shielding housing, an insulated cable shielding and a measuring assembly, the measuring assembly and the shielding housing are sequentially arranged inside the protective housing, a measuring port a is formed on the bottom end face of the shielding housing, the bottom end face of the protective housing is recessed towards the top end face to form a bottom plate and a moving space for horizontal movement of the moving plate, a protective measuring port is formed on the bottom plate, the protective measuring port comprises an opening area a, an opening area b and an opening area c which are sequentially communicated, the opening area b corresponds to the measuring port a, a first cable slot and a second cable slot which correspond to each other and are respectively communicated with the protective measuring port are formed on the side wall surface of the moving space, characterized in that, The insulation cable shield comprises a first part and a second part on the first side and the second side of the measuring port a, corresponding to the opening area a and the opening area b respectively, and a third part fixed on the bottom end surface of the bottom plate; When the moving plate is in the clamping position, the third part is deformed to wrap the bottom end surface of the cable, covering the protection measuring port, and the first part and the second part cover a part of the top end surface of the cable respectively, forming a shielding structure of the cable.

2. The non-invasive cable monitoring device of claim 1, wherein, The first part is fixed on the bottom end surface of the shielding shell and located on the left side of the measuring port a; The second part is fixed on the bottom end surface of the shielding shell and located on the right side of the measuring port a; When the shielding shell is placed inside the protection shell, the first part and the second part are clamped between the shielding shell and the protection shell and cover the top end surface of the opening area a and the opening area c respectively.

3. The non-invasive cable monitoring device of claim 1, wherein, The first part is fixed on the inner side of the bottom end surface of the bottom plate, located on the left side of the opening area b, and covers the top end surface of the opening area a; The second part is fixed on the inner side of the bottom end surface of the bottom plate, located on the right side of the opening area b, and covers the top end surface of the opening area c.

4. The non-invasive cable monitoring device of claim 2 or 3, wherein, A slot facing directly downward is formed in the bottom plate adjacent to the protection measuring port, and the top end of the third part is fixed in the slot.

5. The non-invasive cable monitoring device of claim 4, wherein, The bottom plate further comprises a first protrusion and a second protrusion located in the rear side of the slot in sequence, and the slot, the first protrusion and the second protrusion are on the same axis.

6. The non-invasive cable monitoring device of claim 5, wherein, The moving plate comprises a first step part, a second step part and a third step part arranged in a stepped manner from bottom to top, and a first position clamping groove and a second position clamping groove are formed on the third step part and matched with the first protrusion, wherein: When the first protrusion is matched with the first position clamping groove, the moving plate is in the first clamping position, the second step part faces the protection measuring port, and the front end surface of the first step part is in the same plane as the front end plate of the protection shell; When the first protrusion is matched with the second position clamping groove, the moving plate is in the second clamping position, at least a part of the third step part faces the protection measuring port, and the front end surface of the first step part protrudes from the front end plate of the protection shell.

7. The non-invasive cable monitoring device of claim 6, wherein, First and second matching structures matched with the second protrusion are further formed on the top surface of the third step part, the first matching structure is located in the front position of the first position clamping groove, the second matching structure is located in the rear position of the second position clamping groove, and the second protrusion contacts the second matching structure to limit the position of the moving plate, wherein the first matching structure, the first position clamping groove, the second position clamping groove and the second matching structure are on the same axis.

8. An assembly method characterized by, A method for assembling the non-invasive cable monitoring device of any one of claims 1 to 7, comprising the following steps: The top end of the third part is fixed in the slot on the bottom end face of the bottom plate; The shielded shell with the measuring assembly is placed in the protective shell, so that the measuring port a corresponds to the opening area b, the first part is located on the left side of the measuring port a and covers the top end face of the opening area a, and the second part is located on the right side of the measuring port a and covers the top end face of the opening area c; The protective upper cover is buckled on the top end face of the protective shell, and the moving plate is arranged in the moving space in the protective shell.

9. A monitoring system, characterized by The non-intrusive cable monitoring device of any one of claims 1 to 7, and a collector connected with the non-intrusive cable monitoring device through a shielded wire; The non-intrusive cable monitoring device is configured to output a voltage analog signal of the cable; The collector is configured to obtain an on-off state of the hard voltage plate according to the voltage analog signal.

10. A monitoring method characterized by, A method for implementing the monitoring system of claim 9, comprising the following steps: The cable is placed in the first cable groove and the second cable groove, and the moving plate is moved to the required clamping position, so that the third part of the insulation cable shield is located between the moving plate and the bottom plate, wraps a part of the cable, and covers the protective measuring port; Obtain a voltage data set of the hard voltage plate in a preset time period; Calculate the difference between the maximum value and the minimum value in the voltage data set; According to the difference, the on-off state of the hard voltage plate is determined.

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